Lady Gaga had to cancel four shows, the United Center in Chicago (Feb. 13 and 14); at the Palace of Auburn Hills in Detroit (Feb. 16); and at the Copps Coliseum in Hamilton (Feb. 17), after doctors diagnosed her with synovitis, a severe inflammation of the joints.

The rest of the tour is expected to go on as scheduled and the dates she missed will be made up at a later date her website says.